A former Navy attorney who helped lead the military investigation of the 1967 Israeli attack on the USS Liberty that killed 34 American servicemen says former President Lyndon Johnson and his defense secretary, Robert McNamara, ordered that the inquiry conclude the incident was an accident.

In a signed affidavit released at a Capitol Hill news conference, retired Capt. Ward Boston said Johnson and McNamara told those heading the Navy's inquiry to "conclude that the attack was a case of 'mistaken identity' despite overwhelming evidence to the contrary."

It was "one of the classic all-American cover-ups," said retired Admiral Thomas Moorer, a former Joint Chiefs of Staff chairman who spent a year investigating the attack as part of an independent panel he formed with other former military officials. The panel also included a former US ambassador to Saudi Arabia, James Akins. "Why would our government put Israel's interests ahead of our own?" Moorer asked from his wheelchair at the news conference. He was chief of naval operations at the time of the attack.